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This paper primarily focuses on the analysis on the mixed-phase aiming at obtaining the temperature distribution, the regular of velocity and pressure changes of the dryer. The authors took advantage of the software of the Fluent to establish the model and then simulate the mixed-phase model. Through the analysis, the parameters of the dryer can be figured out. The paper also analyses trajectory of particle in the dryer according to the simulation of the discrete phase. The conclusion of this paper provides the basis for the better understanding the drying mechanism and optimization of the structure design.